CVE-2022-49436 (GCVE-0-2022-49436)
Vulnerability from cvelistv5
Published
2025-02-26 02:12
Modified
2025-05-04 08:37
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
powerpc/papr_scm: Fix leaking nvdimm_events_map elements
Right now 'char *' elements allocated for individual 'stat_id' in
'papr_scm_priv.nvdimm_events_map[]' during papr_scm_pmu_check_events(), get
leaked in papr_scm_remove() and papr_scm_pmu_register(),
papr_scm_pmu_check_events() error paths.
Also individual 'stat_id' arent NULL terminated 'char *' instead they are fixed
8-byte sized identifiers. However papr_scm_pmu_register() assumes it to be a
NULL terminated 'char *' and at other places it assumes it to be a
'papr_scm_perf_stat.stat_id' sized string which is 8-byes in size.
Fix this by allocating the memory for papr_scm_priv.nvdimm_events_map to also
include space for 'stat_id' entries. This is possible since number of available
events/stat_ids are known upfront. This saves some memory and one extra level of
indirection from 'nvdimm_events_map' to 'stat_id'. Also rest of the code
can continue to call 'kfree(papr_scm_priv.nvdimm_events_map)' without needing to
iterate over the array and free up individual elements.
References
Impacted products
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"arch/powerpc/platforms/pseries/papr_scm.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
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"versionType": "git"
},
{
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"versionType": "git"
}
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],
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"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.18"
},
{
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"status": "unaffected",
"version": "0",
"versionType": "semver"
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{
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"status": "unaffected",
"version": "5.18.3",
"versionType": "semver"
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{
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"status": "unaffected",
"version": "5.19",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
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"nodes": [
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"vulnerable": true
},
{
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"descriptions": [
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/papr_scm: Fix leaking nvdimm_events_map elements\n\nRight now \u0027char *\u0027 elements allocated for individual \u0027stat_id\u0027 in\n\u0027papr_scm_priv.nvdimm_events_map[]\u0027 during papr_scm_pmu_check_events(), get\nleaked in papr_scm_remove() and papr_scm_pmu_register(),\npapr_scm_pmu_check_events() error paths.\n\nAlso individual \u0027stat_id\u0027 arent NULL terminated \u0027char *\u0027 instead they are fixed\n8-byte sized identifiers. However papr_scm_pmu_register() assumes it to be a\nNULL terminated \u0027char *\u0027 and at other places it assumes it to be a\n\u0027papr_scm_perf_stat.stat_id\u0027 sized string which is 8-byes in size.\n\nFix this by allocating the memory for papr_scm_priv.nvdimm_events_map to also\ninclude space for \u0027stat_id\u0027 entries. This is possible since number of available\nevents/stat_ids are known upfront. This saves some memory and one extra level of\nindirection from \u0027nvdimm_events_map\u0027 to \u0027stat_id\u0027. Also rest of the code\ncan continue to call \u0027kfree(papr_scm_priv.nvdimm_events_map)\u0027 without needing to\niterate over the array and free up individual elements."
}
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"dateUpdated": "2025-05-04T08:37:37.674Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
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"references": [
{
"url": "https://git.kernel.org/stable/c/b073096df4dec70d0436321b7093bad27ae91f9e"
},
{
"url": "https://git.kernel.org/stable/c/0e0946e22f3665d27325d389ff45ade6e93f3678"
}
],
"title": "powerpc/papr_scm: Fix leaking nvdimm_events_map elements",
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"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2022-49436",
"datePublished": "2025-02-26T02:12:52.044Z",
"dateReserved": "2025-02-26T02:08:31.570Z",
"dateUpdated": "2025-05-04T08:37:37.674Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2022-49436\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-02-26T07:01:20.057\",\"lastModified\":\"2025-02-26T07:01:20.057\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\npowerpc/papr_scm: Fix leaking nvdimm_events_map elements\\n\\nRight now \u0027char *\u0027 elements allocated for individual \u0027stat_id\u0027 in\\n\u0027papr_scm_priv.nvdimm_events_map[]\u0027 during papr_scm_pmu_check_events(), get\\nleaked in papr_scm_remove() and papr_scm_pmu_register(),\\npapr_scm_pmu_check_events() error paths.\\n\\nAlso individual \u0027stat_id\u0027 arent NULL terminated \u0027char *\u0027 instead they are fixed\\n8-byte sized identifiers. However papr_scm_pmu_register() assumes it to be a\\nNULL terminated \u0027char *\u0027 and at other places it assumes it to be a\\n\u0027papr_scm_perf_stat.stat_id\u0027 sized string which is 8-byes in size.\\n\\nFix this by allocating the memory for papr_scm_priv.nvdimm_events_map to also\\ninclude space for \u0027stat_id\u0027 entries. This is possible since number of available\\nevents/stat_ids are known upfront. This saves some memory and one extra level of\\nindirection from \u0027nvdimm_events_map\u0027 to \u0027stat_id\u0027. Also rest of the code\\ncan continue to call \u0027kfree(papr_scm_priv.nvdimm_events_map)\u0027 without needing to\\niterate over the array and free up individual elements.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: powerpc/papr_scm: Se soluciona la fuga de elementos nvdimm_events_map En este momento, los elementos \u0027char *\u0027 asignados para el individuo \u0027stat_id\u0027 en \u0027papr_scm_priv.nvdimm_events_map[]\u0027 durante papr_scm_pmu_check_events(), se filtran en las rutas de error papr_scm_remove() y papr_scm_pmu_register(), papr_scm_pmu_check_events(). Adem\u00e1s, los \u0027stat_id\u0027 individuales no son \u0027char *\u0027 terminados en NULL, sino que son identificadores fijos de tama\u00f1o de 8 bytes. Sin embargo, papr_scm_pmu_register() asume que es un \u0027char *\u0027 terminado en NULL y en otros lugares asume que es una cadena de tama\u00f1o \u0027papr_scm_perf_stat.stat_id\u0027 que tiene un tama\u00f1o de 8 bytes. Solucione este problema asignando la memoria para papr_scm_priv.nvdimm_events_map para que tambi\u00e9n incluya espacio para las entradas \u0027stat_id\u0027. Esto es posible ya que la cantidad de eventos/stat_id disponibles se conoce de antemano. Esto ahorra algo de memoria y un nivel adicional de indirecci\u00f3n de \u0027nvdimm_events_map\u0027 a \u0027stat_id\u0027. Adem\u00e1s, el resto del c\u00f3digo puede continuar llamando a \u0027kfree(papr_scm_priv.nvdimm_events_map)\u0027 sin necesidad de iterar sobre la matriz y liberar elementos individuales.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0e0946e22f3665d27325d389ff45ade6e93f3678\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b073096df4dec70d0436321b7093bad27ae91f9e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
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}